stock rears are weak as shit. Mine is on its way out now.
built ls3 alone should be in the 11’s. is he having serious traction problems or something? that is some weak times out of that setup. Very weak.
Plaf’s old 2000 z28 that had 120k on it, with just drag radials, long tubes and a torque converter ran 12.0 @ 111. Bone stock internal motor.